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Current trends suggest that the Pervasive systems should be adaptive and flexible. Many Message-Oriented Pervasive systems have been proposed to support on-line self-composition of services in reaction to changing contexts. However, most existing service composition mechanisms either do not consider user preferences or use proprietary typing systems. In this paper, we propose an extensible ontology-based autonomous service composition framework for Message-Oriented Pervasive systems. System developers can reconfigure this framework according to their application domains by overriding default hook functions. Experimental results show that the superiority of the proposed approach become obvious along with increasing number of nodes.